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Finding the Fourth Proportional to 7,990.64, 11,979.78 and 5,518.32

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Solution

The fourth proportional to 7,990.64, 11,979.78 and 5,518.32 is: 8,273.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,990.64 : 11,979.78 = 5,518.32 : x
  2. Step 2: Convert to fraction form
    7,990.64/11,979.78 = 5,518.32/x
  3. Step 3: Cross multiply
    7,990.64x = 11,979.78 × 5,518.32
  4. Step 4: Simplify right side
    7,990.64x = 66,108,224.99
  5. Step 5: Solve for x
    x = 66,108,224.99/7,990.64
  6. Step 6: Final answer
    x = 8,273.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.